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'ro ALL wHoM 1T ma CONCERN:

Be it known that I, E. S. HAYWARD, of Roxbury, in t'he'eonnty of Norfolk, in tbe'Sts-te of Mssschutte,

have invented u neiv endy improved Spiral Spring for Beds nndnother purposes; smi I do hereby declare the# the following is a full and exact description thereof, reference being had to theeccompanyingf drawings, and A the lettere of reference marked thereon, all of which teken together form my spcilcation. v

The nature of my invention consists of n spiral spring which shall combine strength and elasticity. I call it sbarrel spring, it being shaped something like a barrel. it has these advantages over the spiral springs new in use, to wit: The straight 'spiral spring (one in which the'diemet'er is equal throughout) can only be depressed to n. space equal to the diameter of wire, (of which it is coustructed, nxultiglied by @e number of coilmbjyI spring c he e'pressedto ,twice the diameter of the wire used, regardless of the number of coils in it. -Over the hour-gless spring (socallefi for, its shape)it1has 'et least two advantages. In that'spring the smallest diameter is in theoentrc er al: equal distance from the ends, making it week at that point and liable to tip over,

` and become thereby useless. My spiing is largest in the centre, orhtY about equnl distance from the ends, and

therefore cannot be tipped over, and can be att'eched to smnller sur-feces. t combines therefore all 'the adventzigcs ofthe straight and hour-glass springs, nml overcomes the priucipai objections te either of them Ifo-enable others skilled in the art to make and use my invention, wli proceed to describe its construction and operation. In the accompanying rulingsy Figure 1 represents un end riewof the spring supposed to be flepressefi. is the cap, A the spiral coils closed into each other.

Figure 2 represents che open spring. S the seat to which it is attached; A the coils of wire; end C' thev can for the purpose of connecting the spring with the slats f a. becistead, or other contrivances for which the' spring may he used. Beginning at the point connected with the seat S, the spring is'wound gradually, increeeing in the circumference of the coils according to the diameter of the wire usati, so that any given peint in the wire will when depressed ciear the outside of the point next below itv in the open spring. It is wound in this wey until the greotesmlesired circumference is reached, which is usually midway 'between S an C, when the winding is reversed to the point where the spring is connected with the cap C. I

Figure 3 represenizs arperspective view oi the sprin'gz I (lo not confine myselghosvever, to springs precisely the sume size at the topsmi bottom I sometimes lessen the number of coils either et the top or bottom, in order to fit to nece? anicap where ene is ierger than the other. What I claim, and desire to secure by LettersPnteng, ifi-4' i i` v .7; A spiral spring with the largest circumference st some point between the ende, substantiall' rasend 'orth" purpose described., ,A A.

- K i e.

Witnesses:

Geo. CLARK, Jr., A. e.. RoBIzsc-N. 

